Cosmological implications of Primordial Black Holes

Understand

The possibility that a relevant fraction of the dark matter might be comprised of Primordial Black Holes (PBHs) has been seriously reconsidered after LIGO's detection of a $\sim 30 M_{\odot}$ binary black holes merger.

• Despite the strong interest in the model, there is a lack of studies on possible cosmological implications and effects on cosmological parameters inference.
• We investigate correlations with the other standard cosmological parameters using cosmic microwave background observations, finding significant degeneracies, especially with the tilt of the primordial power spectrum and the sound horizon at radiation drag.
• However, these degeneracies can be greatly reduced with the inclusion of small scale polarization data.